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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a828cd08d8cb8f4d4ed3a33e558e229d1c788f9c97dbfa85ef6c4fb2e8253d' 
  AND token = 'GP7GhBs12FEn1j6I2lieIVgjrJ+AGBBn9yeLYf9ZQYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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