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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ead26dc7356f7bf7a722b1d1cb43588fc2c036a2ba4a356714c086cd6b2cda6' 
  AND token = 'ohkbgbKD2Pkyk1g08n6VMBxIu2R7Y+72ScwlplxyY6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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