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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc51af5e9ca1e83b6c67d5b624be5c1bc5f7fc29d2caccebe17f084a5040ea02' 
  AND token = 'wn2eOAxtMDlaFxvppMhcBm64pxxrHovG85O1AI6tKIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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