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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18150bcae9f1b1bda2c9b263fd50fe14989a104804e67c1fb6787278bb7b2bdf' 
  AND token = 'IwZ1u5W9eyfzdjoxZGC4xOIa5KpyBaksd3VRdDL+9Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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