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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfcc0aad26937d0af4ffa278bc197563695473d22f2f6e12564c1fd3ed308d7' 
  AND token = 'lgo6RM2nOl7s6PFUtn73+durH2ZU7pwffTSh5/SH8O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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