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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ed58724cd95eed4727511c8ad586d7969f78ce3c3886137686a52a3571e623' 
  AND token = 'fXwbAbu/AKzvT56ohEH+4PlHGr8euEKYebxQyFYAXBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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