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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f0b1fd7be5a992ed899ceba153286e1e449f95374011d9d5acfa2f32a1598e' 
  AND token = 'zy9BZFo97ussd7dodT0LLJnIGP9FQCprF29iJ8mX5Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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