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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0819515f502d63e8a54702a10482b248e89db95102563617303f598739927d11' 
  AND token = 'Wr8oen/yMGizjHcq95tBSNz+k9KWll7aSCK7fANa7CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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