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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ee794ee08614e5aa2852c6d93ca381695880a3a3a8f456ff90ec05267ca14c' 
  AND token = 'n2YxCt5bT7jBIovxQ52MWvvdqEBUEajXPaBv2e9KNzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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