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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61e2d09a4d4eb0f4b802b2d68b93e70c855c75c619381079fd5fb466c35263e' 
  AND token = '9Odop9rfj15fkOO5qCt5GM/tb/CTgw4fsSDHRYyVBis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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