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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8fa942af08243620ee011f64b0e9555f706e7ba2b7f83ccf900df34e93da73b' 
  AND token = 'qo3g7LLgXf+6iuh0ngXzgTbvWkqfQ1FqdQOgXXobW78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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