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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b051ae850e127ea209b7f2c3b4e0a05b713082171f159570e030ae2bf2e5efea' 
  AND token = 'W0pQGU39AVsr7oPTvQG+LYD/las1GtLUWjYs/DXzi7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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