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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36658c309184f871a4ce6f4b368ea6c3a19b3c62d1cc125315ec9efe396240f0' 
  AND token = '/1oZ6mZIQEPsFMGyN1SnVx/F87Ggt8fbBVXoDLgDOs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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