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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15fec79afb87e2a661f3f6e87430f378507186c7cb6a71d7539a31965de4d714' 
  AND token = 'sp9R3H2R9TVHgMvK+W1d9PH1E3YAE/S4/NFu2jNVI+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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