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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89459891c114aa2415c46986eb5108711f80e51ece9335a8a52e596d92cd5946' 
  AND token = '/I5BOhrnjppAILxBJlW0nizJ82cQ+/JSLjR80efBQ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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