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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5b3bf395a6f88ad9687a07c8059a67cdaa0a2e0d3c8beb803d457855f7bb72' 
  AND token = 'ymDnOEr8Vs07nss05LGNKX2GKNFMv+VErPM9/PM4RZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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