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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b1f5bc5f43b7fb6a2f65341ae253956889ca6fa279abb1adae2ae51ea345609' 
  AND token = 'uBVTl9UL7ix38yLib2xF6Wy1UQD6Ybcp+N86XMi8NBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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