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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ed4e62ce9b6f76ed85e5b073a02f9a38c6bb98f0884ab2659b0b5934c30a3d' 
  AND token = 'GHpFfPzW1njHJGojaUD7bw3rADAEOe4RvPXn+7eyK9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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