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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238675e673b877f33693c8be3dab1886141b8fcfd1a5931360af65c1304815c6' 
  AND token = 'Ev3f3bZ3zkXCWeOgNCA7SuU1zn45BMLRKgQ3F8W9hZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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