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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e304dac650e91e644f6665998fa450048cfac5b51e1993c87e2bd72331d8e19d' 
  AND token = 'm+5WAdT8l5Qj9ZvAOIE0xY3c66EXIUbTRMtTNuhXZH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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