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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ecf0155cbd34de056fa930573583b9f43a1cdd0f193d290e615450db66ca6c' 
  AND token = 'TNtqEBCu8RIqQP4guj+UePdd29doQu1vI1bR+6r6lyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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