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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69fdd0051aee9bd3dcc78630ef1c78f766d3ea407945941366e492608308320' 
  AND token = 'rOTyCDfnKGf/kgbdnN1biWz5MoW1LAEBvZylBfy3Q60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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