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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d11d3cfcddfbbd7dcf01bc0af4a650cece7411a6d23be44310493d0eea944a4' 
  AND token = '/SDaf7cgShGnVL8wevdXtP63cCa9CisWUnsoYUX9Ffw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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