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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6835944363f0fd00e13cf7d005b12302e77aac84acae679b6b1a8bf5cdfef456' 
  AND token = 'HcC9gr1ncFg9u6SqODNoMHHseVQOmz0Pw0ODZSLozvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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