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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6696517d6f14d9e8573f8bbba753a0498534aa10a7a68a68ebf1ae519c78390a' 
  AND token = 'rlEw6j/2pi08Bo/iefzf0egiq1bC9NH4DpKaAut4yK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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