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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b97085c36e5872408f2a7f0bcdb9ba04b97b9d37bb5d120b786a27320e6f44' 
  AND token = '89e9cLw3H+bBLop8tKeokj9hv/T3IkHtXTjWR5wsovo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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