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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60531d4363fb26a4d92f448bc2f5b93f3ba315ad38202d1ea5d322ae6802be30' 
  AND token = 'uF4sDJDM4ryZ94bgY/4TfIc4Oqp5LtvuafZk4dD1qtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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