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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd91aa6e80ba1b7a1fec51db636863345bc32a48b959ab277b251bb882433aa' 
  AND token = 'CapohNoVgbEzfROAdqQ68VOIIRhaRvE7uPnxcqBoyqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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