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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe51a585717b0aacb1d3626493360cff64bf7da433544c9c40046659a7f86db' 
  AND token = 'ac/y4SvGqh8P2D3M/A2EgdlnIajuj5BFtapzSPYYBaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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