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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3631237ee13828c8189ce35f7e91d2cddd25222b80629c9b2965eec28be1fe1d' 
  AND token = 'QO9EP0lX4W0tKMhnApieyH4x/xNPF+bcX56AYnLRTzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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