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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507b8fc5aa75ab6286a2d60d0db5b1631ec2a9e8dc0e0163af511d86d5e0206e' 
  AND token = 'A7aXKqc8PiPTgYGveh7qgM3O001mVSHTRu9VOahQ3fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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