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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c41c49f0202df668ab1fd322601a11a1432271082bb129afdaa1dd63164d92e' 
  AND token = 'pPxfm9PC1FVZsIK4peLWTWiPpvAcaTTDi5tA+5z24no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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