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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804b92295b8a7f51b553ddc8785f0e69d702bb872fab5d002d75fc43a8b975c4' 
  AND token = 'ew6UYglbXLeMVSbtUsF/HXnGsFHh2d3Pb34T22Q5pvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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