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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ffdaf5b8b47ae9b575cd332489451c007caaa84fc1717db6a2730b34c01bf93' 
  AND token = '036ZftEksrTpolwCPddN5aivy5JJV3hzxohfGdg26Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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