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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f7fc3405b862bf65c416ba2084889b26ff8bfc9f89ad9abd8f496c3882bfba' 
  AND token = 'OmEETMKcrYh5CWboA9EYhL2prARfwhDDFnCF0310wyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}