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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea63adc281a357cbefdd400c6ba0c237fd33aaceaac70e89847a2de902417e3' 
  AND token = 'W4jX2qpcUttngNgv1T3m1vJoJCOfI3J8G7L0wlJMP7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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