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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332bc64f3fb299ae073e6b8288aab5387159f780781417ba0700409d755346b0' 
  AND token = 'q2J98NhrOt34zj9/27Xp8vzJ9i1IKmtZXmUfrt3zTDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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