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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f152488deb7c5ff826fc332d22443242cf5324d9d0e7a5673e2b467a03264b' 
  AND token = 'yD/YhlqtuYzYGYSf/B37G4aanvCyPS2117lirYuwyS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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