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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc55173a8734f7f4d14e4d18a286cb0b549d22d87c8ebc5c8f80f8ad69f3ca5c' 
  AND token = 'U8i2YdGxvAZsN6CtmzkIGNZup4GOihMaPOfO7odxZwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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