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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d42d7d93b0340cc0169ba0a3a1b3d2131da6e4f775d7179f6f4347dec389e42' 
  AND token = 'm9ChU8tpEZVDWBoAUq3WmxInu4juoRc6z3R8n++GMO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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