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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99df02bed7e5ec0ff695edfc2344c9ad9e96ec1af008969dfd706422b29e7fb' 
  AND token = 'HqqklkNMT1ISQfaeGTyES+0ABn+5If+spEq1uP2tv2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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