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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee8c43811cda4c1b92dc148c14535a76065cdf9d26da743de85bd4162e88983' 
  AND token = 'qGlhEKuykb68wm4tV7S7STw5x9cFnr7PfCczIN64A4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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