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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c5e8fe593abb9c9d257bd8304b159a2280a942e571a943e074fb06809f7f3e' 
  AND token = 'Mhqccvm7uZVYRhVQIkPjXpFPuwL9SRtRfHFDNSh3d8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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