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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872c88481f9603fe158013d08b9271b094ff054e55459ae65ead9fbd5faf537e' 
  AND token = 'hzzF3KDFezJpzdjXzdiZ2YaxuZ8jYwqdk0x/lYUYxO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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