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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a18a9685e0616603eb1bde5d83f815a8e5d3a6035d0223dae6315a351308fd' 
  AND token = 'Gm1GXe1FAMlnJ20yaJHPaTKUR2tYqUtaH09mKgqm5Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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