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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1bc97ee4eb08cb1d8514412c67b0fe0b9dae531dddea13579d90f4f992dcb2' 
  AND token = 'k0mKfGOw8B2Kc0ivaX0u4coulpiHTcQtvnBnsxaH1fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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