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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0174bf3eabd9eada57af6652f4c96b146ac936b2be4b3ba49e294de8319169e' 
  AND token = '9J3Oq53l3YeWJNmlFq38rnzSxygKnGDoUcW0VQNT/Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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