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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d65c078ebe4d7e45b1a9e350aba83cdfe8f44cc7d66bcd0a44ed41f575204a3' 
  AND token = 'jvzyMGSHAlr/t2nDVQukeF9b8tG5qfgL/UBPBeBAqXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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